JPH01289023A - Method of fixing wire to clasp and insulator - Google Patents

Abstract

PURPOSE: To easily fix a wire in a short working time by using a clamp made from a firm but bendable material and a clip formed with a gripper element. CONSTITUTION: When a wire 9 is fixed to an insulator 1, a L-shaped flange 14 is slided in a L-shaped rib 16 until a wire gripper element 15 is placed right under the flat portion 10' on the upper wall of a clamp 10 to mount the wire gripper element 15 or a gripper 15a on the clamp 10. Then, the clamp 10 is manually mounted directly onto the press device of a tool and located above the saddle portion of an insulator 1 under the insulator 1 and a wire 9 with the first and second hook devices. A ram 23 is excited to move the hook devices up so that downward pressure can be applied onto the clamp 10 and the gripper element 15 by the press device until the clip holding the wire is firmly fastened to the insulator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clasp for fixing an electric wire to a pin-type insulator and a method for attaching an electric wire to the pin-type insulator using the clasp.

[Conventional technology]

tPA trims are often used on utility poles and towers to prevent the high voltage electricity flowing through the lines from being discharged to the ground or to other lines.

A typical pin-type insulator is fixed to the crosspiece of a utility pole or tower and has an upper saddle portion on which the wires rest.

To date, electrical wire has most commonly been attached to its insulation by manually wrapping and twisting a small diameter electrical wire around the wire and saddle section.

[Problem to be solved by the invention]

These mounting methods and means are inadequate for four reasons.

1) An operator who must climb a telephone pole or be raised onto a live wire by climbing into a crane packet uses a tool with a 180C11 (6 foot) long insulated ball to remove small diameter wire. It is difficult to perform unwieldy windings.

2) This method is time consuming.

3) Such mounting methods do not prevent the wires from slipping away from the insulation if they are severed by a falling tree during a rainstorm, for example, and this is because utility poles or towers are usually located very far apart from each other. This can result from the relatively heavy length of the hanging wire between the insulators and, therefore, if the wire is broken, its weight will be carried downwardly and across the insulator, causing its windings. tend to pull against smaller diameter wires.

4) Connection lines are known to cause interference in the AM band.

In view of the foregoing, a first object of the present invention is to provide a clasp and a method for fixing an electric wire to an insulator, which eliminates the above-mentioned drawbacks.

Another object of the invention is to provide a clasp and method of the above-mentioned characteristics that is simple in design and easy to install on an insulator.

Another object of the invention is to provide a clasp having the above-mentioned characteristics that does not require high manufacturing costs.

[Means to solve the problem]

The foregoing and other objects and advantages of the present invention are achieved in accordance with a preferred embodiment by a clasp comprised of a clamp and gripper element made of a rigid but pliable material. As will be explained hereinafter, the clamp is provided with devices at each end adapted to securely grip the flat upper portion and the saddle portion of the insulator. The clamp is adapted to be positioned directly over the insulator and tightened to the insulator. Within the clamp is a wire gripping element made of a resiliently deformable material such as a suitable elastomer.

The wire gripping element is comprised of a body portion including a generally planar upper surface, and a lower surface of the body portion is provided with a first longitudinally extending groove. On both sides of the gripper element, a device is preferably provided for attaching the gripper element to the clamp. Both sides of the gripper element are furthermore preferably provided with first longitudinally extending walls which project slightly outwardly. These first walls each merge with the body portion.

A second downwardly extending wall also projects from the body portion.

A second wall extending in the length direction is provided at the inner lower tip of each second wall.
A groove is provided.

During fixation, the two second walls are transformed inwardly from their initial configuration to a fully permanently folded configuration in which three grooves are formed of a circular cross section adapted to securely grip the wire therein. Define the hole. This deformation of the second wall is assisted by the initially straight first wall which abuts the lower side of the clamp. At the same time, the clamp is tightly tightened to the insulator.

It is within the scope of the present invention to accomplish such attachment of the wire to the saddle portion of the insulator by relying on a hand tool connected to an arrangement of mechanical parts adapted to accomplish a series of steps.

The mechanical portion consists of a pair of spaced apart legs joined together by a longitudinal yoke member, which in turn is attached to an expandable ram mechanism.

Each leg has a lowermost first hook device adapted to grip the lower edge of the insulator and a second lowermost hook device adapted to capture and raise the wire extending above the saddle portion of the insulator. It has a hook device.

The expandable ram mechanism includes a ram that presses downwardly against the clamp;
A pressing device is fixedly adapted to produce the lifting action of the second hook device and the locking action of the first hook device.

Therefore, the method of securing the wire to its insulator can be summarized as follows.

a) Fixing the gripper element to the clamp by means of its fixing device.

b) Manually attach the clamp directly to the pressing device of the tool and position it above the saddle portion of the insulator by first and second hook devices, under the insulator and wire, respectively.

C) Activate the ram to raise the hook device and apply downward pressure on the clamp and gripper element with the press device until the catch holds the wire and the catch is firmly clamped to the insulation.

d) Remove the tool.

〔Example〕

The foregoing will be more clearly understood by referring to the preferred embodiments of the present invention illustrated in the accompanying drawings.

Referring first to FIG. 1, there is shown a typical and conventional insulator 1 made of an electrically insulating material such as porcelain. The insulator l is formed with a generally frustoconically shaped lower skirt part 2 comprising a pair of concentric base parts 3.4, the smaller of which is rigidly fixed to a support column 5, which On the contrary, it is attached to a crosspiece 6 (as shown in FIG. 5) of a telephone pole or tower (not shown). The upper part of the insulator 1 has the general shape of a transverse saddle, including a central arcuate cradle 7 and a protruding portion 8 .

The saddle is adapted to support a longitudinally extending wire or cable 9 to be charged.

1, 2 and 4 show a clamp 10 according to the invention.
It shows. The clamp is preferably made from an aluminum extrusion cut to length and machined to consist of downwardly curved portions 10 at each end.
Each downwardly curved portion 1o'', including a flat portion 10' that merges with the 10', is horizontally inwardly bent at its lower end to define a flange 11 with an innermost semicircular notch 12. The curved part 10', the flange 11 and the semi-circular cut-out 12 constitute a gripping device. Each semi-circular cut-out 12 is provided with a central cut-out 12a. The clamp 10 has a flat part 1
At each junction of the downwardly curved portion 10'' with 0', a longitudinally extending outer ridge 13 is provided. A pair of longitudinally extending L-shaped flanges 14 are provided.

Wire gripper element 15 is adapted to be used complementary to clamp 10. The wire gripper element 15 is made of an elastically deformable, essentially electrically partially conductive elastomeric material, such as rubber containing a carbon component. The initial shape of the wire gripper element 15 is preferably formed by an extrusion process and can then be easily cut into pieces of desired length.

The wire gripper element 15 has a body portion 15';
Its upper surface includes a pair of laterally spaced L-shaped ridges 16 as shown clearly in FIGS. 2 and 3. The ridges 16 are adapted to receive the L-shaped flange 14 and the mounting constitutes a device so that the wire gripper element 15 can be secured to the clamp 10 as shown.

Each ridge 16 defines a continuous angularly outwardly projecting first wall 17 . The first wall 17 merges with the body portion 15'.

A pair of second walls 18 also merge with the main body portion 15'.

Each second wall is positioned below and in general alignment with each adjacent first wall 17.

A first groove 19 is formed in the middle of the lower surface of the body portion 15' and extends longitudinally in a semicircular overall cross-sectional shape. The first 19 has a ■-shaped notch 19a on each side.
The sides are defined by

The lower inner extremities of both second walls 18 are provided with a second groove 20 in the general shape of a quadrant.

The gripper 15a of the second embodiment is similar except for dimensions and includes a small groove 19', a groove 20' and a thin body portion 15'.

The two second walls 18 are adapted to be bent inward from the initial configuration shown in FIGS. 2 and 3 to the permanently bent and installed configuration shown in FIGS. 4 and 4a. What is happening will become clear by reading Figures 2, 3, 4, and 4a. In the configuration of FIGS. 4 and 4a, the first groove 29 or groove 19' and the two second grooves 20
Alternatively, the grooves 20' each form a hole 21,22 of circular cross section and dimensions to grip and frictionally hold the wire 9.

The wires can, of course, be of varying dimensions as shown in the figures. ing.

Referring now to FIGS. 5-9, clamp 10
The method of using the wire gripper element 15 is illustrated together with the tools used for the purpose of carrying out the method.

5 and 6 show a power plant consisting of a spring return cylinder and piston ram 23 rigidly attached to the hand handle 24 by a universal joint 24a. held by the operator in a crane packet etc. Expansion forces, such as hydraulic pressure, may be applied to or within the handheld handle 24 along with an operating lever on the handheld handle 24.
It can be delivered to the piston ram 23 through a tube running along the piston ram 23.

The spring return cylinder and piston ram 23 are made integral with the transverse horizontal yoke member 25.

Each opposing end of the horizontal yoke member 25 includes a downwardly projecting leg 26. The lower end of the leg 26 carries an inwardly directed hook 27 forming a first hook arrangement, as best seen in FIG. Hook 27 is insulator 1
It is adapted to capture the bottom edge of the lower skirt portion 2 of the.

Intermediate between the upper and lower ends of the leg 26 is a laterally outwardly bent portion 26' having a lowermost hook rest 28, the lowermost hook rest forming a second hook arrangement. There is.

Immediately below the lowermost hook rest 28 each leg 26 can be made with an enlarged hollow portion 26'. Hollow part 2
6' is internally threaded so that the complementary threaded upper end of the lower part of the leg 26 can be adjusted in length by screwing into the hollow part 26' of such lower part of the leg. It is. The distance between the hooks 27 and 28 of each leg 26 is therefore m! to accommodate the different dimensions of the insulation. It is possible.

Completing the tool is a pressing device consisting of a rigid press plate 29 with a flat intermediate region 30 rigidly fixed to the distal end of the ram-piston rod 31; It is adapted for vertical movement, as indicated by arrow 32 in FIG. The intermediate region 30 merges on both sides with a laterally outwardly downwardly projecting portion 33 and conversely with a laterally outwardly projecting shoulder 34 at the extreme end.

The shoulders 34 are adapted to contact and press against the respective outer ridges 13 of the clamp 10.

At both ends, the press plate 29 introduces flanges 35 which guide and grip the catch with an outwardly flared lower end 35'.

The installation of the clasp is as follows.

a) shape flange 14 until the wire gripper element 15 is directly below the flat earth wall 10' of the clamp 10;
The wire gripper element 15 or gripper 15a is clamped 10 by sliding the wire gripper element 15 or gripper 15a into the L-shaped ridge 16.
Attach to.

b) pressing the clamp 10 against the press plate 29;
It is held by a flange 35 for guiding and holding.

C) carrying the wire gripper element 15 or gripper 15a using the hand-held handle 24 and positioning it on the wire 9 so that the flange 11 of the clamp lO rests on the respective protruding part 8 of the insulator 1; The electrical wire 9 is thus partially engaged between the two second walls 18 of the wire gripper element 15, as shown in FIG. extends,
The legs 26 project downwardly onto each side of the insulator 1, with the lower hook 27 and the upper hook 28 poised to engage first above the bottom edge of the wire 9 and then with the insulator 1. to go into.

d) Exciting the piston rod 31 of the ram 23 downwards, thus raising the ram 23, resulting in two conditions. That is, the hook rest 28 engages and raises the wire 9 so that the wire 9 clears the required space between the wire 9 and the cradle 7 and the two of the wire gripper elements 15
a state that allows the insertion of the second wall 18 into the required space and a state in which the hook 27 engages with the insulator 1.

e) As shown in Figures 8 and 9, the piston rod 3
1 is further excited to apply downward force to the clamp 10 and the wire
The gripper element 15 is applied to hold the wire 9 firmly above the cradle 7 of the insulator 1. press plate 2
9 presses the clamp 10 with its shoulder 34 acting on the outer ridge 13, and as this pressing action continues I, z (see FIG. 8), the second wall 18 pushes against the cradle 7.
is forced to bend inward on the underside of the wire 9, following the contour of the wire. This condition is obtained because each second wall 18 is initially aligned with its associated first wall 17 (see FIG. 2) which effectively transmits the pressing force, and then the first wall 17 is gradually moved outward. The V-shaped notch 19a allows this closing, widening upward and eliminating undesirable forces being exerted upwardly against the distal end of the flat portion 10'. (The final shape of the wire gripper element 15 is shown in Figures 9, 4 and 4a) Due to the bendable nature of the weakest central portion of the clamp 10, simultaneous deformation of the wire gripper element 15 occurs. There is a movement of the flange 11 around and under the protruding part 8, so that the semicircular notch 2 is finally formed on the underside of the protruding part 8, as indicated by the dotted line 36 in FIG. It is locked at. A downward push is exerted on the spaced apart outer ridges 13 so that the flat portions 10'
is bent, so that the fully installed configuration of the clamp 10 has a slightly convex shape on the flat portion lO' (see FIGS. 4 and 4a) to more firmly grip the clamp 10 onto the insulator l. Form 10'a is included.

f) actuating ram 23 in the opposite direction to release hooks 27 and 28 from lower skirt portion 2 and wire 9;
Move 3 back.

Each central notch 12a is used for the purpose of inserting a tool (not shown) which acts to pry open the clamp 10 when the clasp needs to be replaced.

[Brief explanation of the drawing]

1 is a perspective view of a clasp according to the invention prior to installation, also showing the insulation and wire or cable segments; FIG. 2 is an end view of an embodiment of the clamp and gripper element for a given wire size; FIG. 3 is a cross-sectional view of another embodiment of the gripper element for small wire dimensions; FIGS. 4 and 4a respectively show a half-stop of the catch, a half-stop of the upper part of the insulator and the first and second embodiments of the gripper. FIG. 5 is a side view of the insulator, the segment of wire attached to the insulator, and the tool and catch positioned above the insulator; FIG. , FIG. 6 is an end view corresponding to FIG. 5 at right angles to FIG. 5, and FIGS. 7 to 9 are successive end views showing the method used for the purpose of effecting the installation of the clasp. [Explanation of symbols] 1... Insulator 7... Cradle 9...
-Wire 10...Clamp 15...Wire gripper element 15'...Body portion 17...First wall 18...
・Second wall I9...First groove 20...Second groove procedural amendment ceremony) March 29, 1999 Director General of the Japan Patent Office Yoshi 1) Moon Takeshi 1, Indication of the case - 15 + 1 Title of the invention: Method for fixing electric wires to clasps and insulators 3, Relationship to the case of a person acting as an assistant city Patent applicant address: Quebec, Canada Suite 1001 St. Joseph Street 290 Name Siibiyev Sekiyuri Cap Inc. Representative Gaston Fortin Nationality Canadian Country 4, Agent

Claims (1)

[Scope of Claims] 1. A clasp for fixing a wire to a pin-type insulator having an upper saddle portion, the clamp having an upper portion made of a resilient but bendable material; comprising a gripping device provided at both of the two lateral ends for securely gripping the part; furthermore, a gripper element positioned within said clamp and having a body portion made of a deformable, elastomeric material; a pair of first walls extending laterally and projecting upwardly, one at both lateral ends of the body portion, the body portion and the first wall contacting the upper portion of the clamp; a pair of second walls extending in the horizontal direction, projecting downwardly from the main body below the first wall, and continuous with the first wall; positioned on the lower surface of the main body and at the center of the main body; a first longitudinally extending groove in the innermost lowermost tip of each of said second walls; a second longitudinally extending groove in said second wall when said second wall grips said saddle portion; is deformable inwardly toward a fully collapsed final configuration under the action of the first groove and the second groove defines a circular hole adapted to securely grip an electrical wire therein. A clasp consisting of a clasp. 2. The clasp of claim 1 further comprising an attachment device for attaching said gripper element to said clamp. 3. The saddle portion includes an arcuate lateral cradle and a protruding portion at each end, and the gripping device has a downwardly curved portion that merges with the upper portion at each end of the downwardly curved portion; 2. A clasp as claimed in claim 1, comprising inwardly curved flanges at the outer ends of the portions; said flanges having arcuate notches adapted to securely grip each of said projecting portions. 4. The clasp of claim 1, wherein the outer surface of the second wall has a bend and shape on each side thereof to match the curved arc of the cradle in the final configuration of the second wall. 5. a pair of longitudinally extending laterally spaced apart L-shaped flanges, the attachment device being secured to an inner surface of the clamp; 3. The clasp of claim 2 comprising a pair of complementary spaced L-shaped ridges engageable with the flange. 6. The clasp of claim 3, wherein each said notch is provided with an outwardly extending notch adapted to engage a tool to remove said clamp at a desired time. 7. The clasp of claim 5, wherein said upper portion defines a pair of spaced apart longitudinally extending upwardly projecting ridges. 8. A method for fixing a wire to an insulator of the type having a saddle part formed with a central arcuate cradle portion for receiving the wire and a lateral protrusion at each end, comprising: a) attaching a clasp directly to the saddle part; positioned upwardly; said catch includes a clamp made of a resilient but bendable material and having a gripping device gripping said insulator and a pair of spaced apart longitudinal ridges; a wire gripper element having an attachment device for attaching to the inner surface of said clamp and being made of a deformable but elastomeric material; said wire gripper element further having a body portion and an attachment device extending upwardly from said body portion; a pair of first laterally spaced walls protruding from each other;
a pair of downwardly projecting second walls on the lower side of the walls; a first longitudinal groove provided in the lower surface of the body portion; a first longitudinal groove formed in each lower inner tip of the second wall; b) raising the wire away from the cradle; c) pressing the second wall against the cradle and causing the second wall to move inwardly under the raised wire; and d) pressing the clamp against the protrusion and gripping the insulator with the gripping device. 9. Claim 8, wherein the force used in forcing step b) is directed onto the two ridges and causes a lateral bending of the portion of the clamp located between the two ridges. the method of.